TiAl金属間化合物のX線応力測定(X線材料強度小特集)

概要

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X-ray stress measurement for TiAl intermetallic compound of interest as a new structural material was investigated. Arc-melted Ti-48 mol% Al alloy employed in this study exhibited rather preferred orientation because of its lamellar structure. Two approaches were adopted to the measurement for TiAl(311) plane by using Cr-Kα characteristic radiation and a position sensitive proportional counter (PSPC) : an oscillation method and a method utilizing only two {311} reflections that belong to one zone axis. The results obtained are summarized as follows : (1) The measurement with the oscillation method resulted in the X-ray stress constant, K=-383 MPa/deg, and X-ray elastic constant, E_x(1+υ)=129 GPa or E_x=166 GPa. (2) The X-ray value of E_x in TiAl phase was intermediate between the mechanical values of Young's modulus of the present material and Ti-50 mol% Al consisting of almost TiAl single phase reported by R.E. Schafrik. (3) The X-ray stress constant determined by the latter method was -347 MPa/deg and agreed nearly with that obtained by the former method. (4) The non-linearity observed in sin^2ψ diagram was caused by X-ray of the fixed ψ_0 method. The oscillation method by using PSPC was, however, considered to be able to provide the reliable approximate values of K and E_x by reason of above (1) and (2).
社団法人日本材料学会の論文
1994-07-15